<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        #fd { 
            width: 100px;
            height: 100px;
            background-color: red;
            float: left;
        }

        #sd {
            width: 100px;
            height: 100px;
            background-color: blue;
            float: left;
        }

        #td {
            width: 100px;
            height: 100px;
            background-color: green;
            float: left;
        }

        #container {
            margin: 0px auto;
            width: 400px;
            height: 500px;

            background-color: darkgray;
        }

        #id {
            clear: both;
        }

    </style>
</head>
<body>
    <div id="container">
        <div id="fd"></div>
        <div id="sd"></div>
        <div id="td"></div> 
        hello warld!hello warld!hello warld!hello warld!hello warld!
        <p id="text">hello warld!hello warld!hello warld!hello warld!hello warld!
        </p>
    </div>   
</body>
</html>
